Improved stone-drill



l jay.

N. PETERS. PHOTO-LITHOGRAPHIE. WASHINGTON. D. C.

intd tant @time dimite.

w. QEDENFIELD, or SAVANNAH, Missoni.

Letters Patent No. 95,67 2, dated October 12,1869; ll-ntedated'September27, 1869.

IMPRO'VED' STONE-DRILL.

The Schedule referred to in these Letters Patent and making part of thesame.

To all whom, it may concern.:

Be it known that I, W. C, EDENFIELD, of Savannah, in the countyofAndre\v and State of l\[issouri, have invented a new and in n'provedStone-Drill; and I do hereby declare that the following is a full,clear, 'and exact description thereof, which will enable others skilledin the art to make and use the same, reference being had lto theaccompanying drawings, forming part of this speciiication, in which-Figure 1 represents a side elevation o f my improved stone-drill.

Figure 2 is a vertical transverse shaft of the same, taken'on the planeofthe line a: talig. 1.

Figures 3, 4, and 5 are detail plan views of the adjustable guides forthe drills.

Similar' letters of'reference indicate like parts.

The object of this invention is to reduce the friction against thereciprocating drills.

The improvements relate` to the rock-drilling machine, for'whioh LettersPatent of the United States were issued to 'A. M. Southard and NV.' J.Hobson, on the 3d day ot September, 1867,'and on the 28th day of April,1868.

The invention consists'in providing the .adjustable eyes or guides'off'the drills with ii'iction-rollers, which have concave. faces adaptingthemselves to the circular ilmer faces of the said eyes, so` that thecylindrical'drillsean play in. them with reduced friction.

B is the horizontal operating shaft, which carries the cams c c, forworking the drills D.

The' shaft B has its bearings in au up-and-dowu adf justable frame, E,which can be raised orlowered by shanks d al, fitted through slottedbars H, that are attached to the frame.

ers in the eyes are made with concave sides, so as -tou be adapted tothe'drills, as shown. The eyes are adjustableyas aibresaid, and asdescribed in the :libre-mentioned Letters Patent.

To the franie A aie pivoted bars I I, that are provided withextension-pieces J, so that they can he lengthened or shortened at will.They serve to brace the frame in an inclined or other suitable position,in case the holes to be bored are to be oblique or on uneven ground. y

f j' are the shoulders, fitted upon the drills, to allo'w the cams tooperate said drills. Above these shouldersare fitted around the drills,coiled springs g g, that are, when the drills are raised, compressedagainst altupper slotted bar, K, arranged on the frame A, and that serveto drive the drills down with greater force.

Having thus described my invention,

IK claim as new, and desire to secure by Letters Patent The eyes Gr G',constructed as described, with the screw-Shanks d, and the internalfriction-rollers c, and adapted for adjustment laterally in thehorizontal grooved lbars c, as herein described, for the purpose JOHN J.MrLLEn, Gno. H. Honsox.

